Valve



June v'15 1926. 1,588,752

F. LANG VALVE Filed Oct. 3l, 1925 2 Sheets-Sheet 2 Patented June 15,1926.

UNITED STATES FRANK LANG, OF PHILADELPHIA, PENNSYLVANIA.

VALVE.

Application filed October 31 1925. Serial No. 65,956.

My invention relates to valves and more especially to balancedcheck-valves designed for use in pipe lines where valves very s cnsitiveto pressure are required such, forinstance, as pipe connections leadingfrom steam turbines to superheaters. Y

It is essential that such valves should be sensitive to very slightdifferences in pressure, and it is highly desirable that all parts ofthe valve be readily accessible without removal fro-in the pipeconnection; that the flow of steam from the turbine to the superheaterbe unobstructed except by the valve, and that the friction be reduced tothe minimum, and the object of my inven* tion is to provide a valve ofsimple construction which will meet these requirements more perfectlythan the valves heretofore used.

This object, and other advantageous ends which will be describedhereinafter, I attain in the following manner, reference being had tothe accompanying drawings in which Figure 1 is a section through a valveand r valve housing embodying my invention and showing the valve closed,some of the parts being shown in elevation,

Figure 2 is a section on line 2-2 of Figure 1,

Figure 3 a view similar to that shown in Figure 1 but showing the valveopen, and Figure 4 a section on line 4-4 of Figure 1. Referring to thedrawings, 1 indicates the valve chamber which communicates with theturbine through a union 2 and with the superheater through a union 3. Itis closed at the top by a removable plate 4 which carries the usualmechanism for closing the v alve when it is desired to shut offcommunication between the turbine and the superlieater, 5 indicates thevalve disk and 6 the valve seat. A stem 7 is detachably and pivotallyconnected to the valve by a collar 8 having two plane sides, seated inan angular recess 9 in an annular lug 10 extending from the rear of thevalve disk and held in place by an annular plate 11 bolted to the lug.The stern at the end next the valve disk has a'rccess 12 within which`one end of an angular link 13 is pivotally mounted on a pin 14, theother end of the link being fixed to a rod 15, pivotally supported inthe valve housing and having one end extending through the housing. Link13 has a heel or boss 16 adapted to be engaged by an enlargement 17 onthe inner end of a threaded rod 18 for positive closing of the valve,but normally out of engagement therewith. The other end of the stem isreduced at 19 and one end of a link 20 is pivotally connected to thereduced part byl to the end of rod 15 which extends through the housingand a slidable weight 25 is mounted upon the arm. By adjusting thisweight to positions nearer to or `further from rodv 15, the weightsustained by link 13 may be counterbalanced to any desired degree and aperfect balance of the valve parts obtained. Y

lVhen it is desired to positively close the v'alve, which may beeffected by screwing rod 18 downward against boss 16 on link 13 thepressure is exerted in a line practically co-incident with the axis ofrod 1S and the closure is made with a minimum of friction.

By the construction above described all of the working parts are housedin the valve chamber and are readily accessible, the valve seat may bereadily reground without removal of any part except the capand the valveis perfectly balanced whether partly open or wide open.

lVliile I have described my invention as taking a particular form, itwill be understood that the various parts may be changed withoutdeparting from the spirit thereof, and hence I do not limit myself tothe precise construction set forth, but consider that I am at liberty tomake such changes and alterations as fairly come within the scope of theappended claims.

Having thus described my invention, what I claim as new and desire tosecure by Letters Patent is 1. A check valve including a valve disk; astem connected with the rea-r of the valve disk; a link pivotallyconnected with the y stein adjacent the valve disk, and a link pivotallyconnected with the rear of the stem.

2. A check'valve including a valve disk; a stem connected at one endwith the rear lia Cil

of tlie valve disk and Weighted at its opposite end to counterbalsncethe valve; a link pivotally connected with the stein adjacent the vulvedisk7 and a link pivotelly connected with the stein intermediate itsends.

3. A. clieck veli/e including,` a valve disk; i stein connected with therear of the valve disk; an angular link pivotally connected with tliestein adjacent the Valve disk; ind n, link pivotally connected with tlierear oi the stein.

4. A Check Valve including a Valve disk; :L stein; a connection betweenthe Valve disk und the stein whereby tlie disk may rotate relatively tothe stein; a link pivotally Connected with the stein adjacent the disk,and a link pivotally connected with tlie rear 0i' the stein.

5. A check valve including a. Valve disk; n stein; a collar on thestein; a bearing for tflie collar in the rear of the disk; means forholding the collar in its bearing; n link pivotully connected with thestein adjacent the disk7 und a link pivotally connected with the rear ofthe stein.

G. A check valve including a Valve disk; a stein connected to the disk;4en angular link pivotzilly connected with the front of and adapted tosupport the stein; a link pivotally connected with and adapted tosupport the rear of the stein, and ineens on tlie rear end of the steinfor counterbalancing,` the Weight of the disk.

'i'. A olieek valve ineluding at valve disk; a stein connected to thedisk; a link pivote filly Connected with the front of the stein andadapted to support the disk; :i link pivotnlly connected with andadapted to support the rear of the stein; and a eounter- Weightedjustably connected with tlm disksupporting link.

8. A Cheek valve including` a valve disk; a stein connected to the disk;a link pivotallyv Connected with the Jfront of tlle stein and adapted tosupport the disk; a link pivotally connected with and adapted to supportthe rear of the stein; ineans 0n the stein for counter-balancing' theWeight of the disk and it counterweiglit adjnstnbly con- :w

neeted with the disk-supporting' link.

9. A Check valve including a valve disk; a stein detaeliably Connectedwith the rein' of the valve disk; a link pivotully connected with thestein adjacent the valve disk; and :i f

link pivote-ily connected with the redr of the stein.

In testimony whereof I lime signed my naine to this specification.

FRANK LANG.

